The following describes how to realize the parameterized design of the part drawing of the bolt flange connection static sealing system. Since the structure of the relational model is simple, it can deal with the connection between complex things. Therefore, the author uses the relational data model here, in the database. Each table has an independent name and establishes a connection between the records in the table and the geometric model and the information model, and accesses the records in the different tables for parameterization purposes. A model is an engineering framework for all components in engineering design. The information model mainly refers to the dimensional information required by the database to generate drawings, and provides the necessary data for the title bar and schedule of the part drawing. The geometric model refers to the geometric description of various objects with different structures and the realization methods of their parameterization. For example, different types of flanges have different information models and geometric models, and the types of geometric models and information models are obtained through human-computer interaction input methods. To complete the parametric design of the graphics.
The operation of the model is mainly to perform specific package implementation parameterization based on the description of the primitive object. The description of the primitive object includes the processing of graphics data and the processing of non-graphic data. Among them, non-graphic data processing has three processing methods in AutoCAD 2000: attribute; extended entity data; extended data dictionary and extended data record. For example, the non-graphic data of the label 1 in FIG. 3 includes: entity information, label information, assembly information, and the like, wherein the entity (taking a line segment as an example) information includes: a type of a line segment, a starting point of a line segment, an end point of a line segment, a line type, Color, etc., the label information includes: labeling method, direction (horizontal, vertical, tilt), distance between the element and the dimension line, tolerance, roughness, etc. The assembly information includes: assembly point, assembly line, positioning point, and the like. These can be added to the database of the primitive object with specific rules using the above three methods. Automatic generation of dimensioning, tolerance and surface roughness of part drawings. Based on the two-dimensional graphic data structure, the graph theory and grammatical basis and the directed graph adjacency matrix judgment method for automatically labeling the mechanical pattern size have been proposed, but both There are major difficulties in practical application. <7>. Analyze the part drawing of the bolt flange connection system. The structure of the bolt flange connection system is not very complicated. In the above, each method object is attached with the method of expanding data, and the entire drawing is browsed. All the primitive objects in the object obtain the extended data description of each primitive object. If the solid object has descriptions of dimensions, tolerances, surface roughness, etc., the dimensioning can be automatically implemented according to its corresponding constraint form. However, it should be noted that the dimension of the chamfer is different from other dimensioning. It is not an internal dimension block. The text and the lead are simple entities. They should be the same as the surface roughness. They can be inserted with fixed symbol parts. , its value can be entered interactively. Automatic labeling of tolerances can be achieved by neural network methods or other automated labeling methods.
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